JP2002023733A - Picture compositing processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture compositing processing device for improving displayable colors of graphic picture data in an arbitrary composited display area or its peripheral area. SOLUTION: This device comprises a color information table part 13 having plural color information tables permitting to extend a bit width, a filter part 14 capable of varying magnification of the picture data outputted from the color information tables, a picture compositing part 18 for compositing the picture data outputted from the filter part 14 and 2nd picture data, an area generation part 17 capable of generating at least one composited display area, and a color information table control part 20 to which the graphic picture data and the area signal of the compositing area are inputted, and which is able to make the different color tables correspond to the picture data displayed in the compositing display area and the picture data displayed in the display area other than the compositing display area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image synthesis processing apparatus for synthesizing graphic image data and image data and outputting the synthesized image data to a display device. Regarding control.

[0002]

2. Description of the Related Art Conventionally, there has been known an image synthesizing processor for synthesizing graphic image data and image data and outputting the synthesized image data to a display device.

FIG. 8 is a block diagram showing a configuration of a conventional image synthesis processing apparatus. The image synthesis processing device 4 in FIG.
A graphic image output device 70 for outputting graphic image data, an image data output device 80 for outputting normal image data, and a cathode ray tube (C
RT), liquid crystal, plasma display panel (PD)
It is connected to an image display device 60 having a display screen such as P) and capable of displaying an arbitrary image.

In the image synthesizing processor 4, reference numeral 11 denotes an input terminal to which graphic image data from the graphic image output device 70 is input, and reference numeral 12 denotes image data (second image data) from the image data output device 80. Reference numeral 13 denotes a color information table section provided with a color information table for expanding the bit width of graphic image data input from the input terminal 11; Reference numeral 15 denotes a filter control unit that controls the operation of the filter unit 14.

A display timing generator 16 generates a timing signal such as a vertical and horizontal synchronization signal necessary for displaying each image data inputted to the image display device 60, and 17 is a display timing generator. An area generating unit that can set at least one area having a size equal to or smaller than the area displayed on the image display device 60 by the image data and output the area signal;
Is an image synthesizing unit that switches between graphic image data output from the filter control unit 15 and image data input from the input terminal 12 in accordance with the area signal from the area generation unit 17. Are output to the image display device 60.

Next, the operation of the image composition processing apparatus 4 shown in FIG. 8 will be described. Graphic image data input from the input terminal 11 is, for example, image data of a format having 8 bits of data per pixel (hereinafter referred to as CLUT8 format) or an image of a format having 4 bits of data per pixel. Data (hereinafter, referred to as CLUT4 format).

When these graphic image data are input from the input terminal 11, first, the color information table 1
3 is input. In the color information table section 13, the input graphic image data is extended. This extension
For example, outputting as limited color data in 24-bit full color using a color information table (color lookup table: CLUT). Further, the color information table is generally constituted by a random access memory (RAM). That is, the input terminal 11
The graphic image data in the CLUT8 format or CLUT4 format input from is input to the color information table as an address of the RAM, and the color information table outputs color information data corresponding to the address. The data of the color information table stored in the RAM in the color information table unit 13 can be set in advance by a control unit (not shown) in accordance with the use environment, the user's preference, and the like.

Further, as is generally known, if the output of the color information table unit 13 is 24 bits, the CLU
When graphic image data in T8 format is input,
The data output from the color information table unit 13 is 167
Of the 70,000 colors, 256 colors are output as limited color data and can be simultaneously displayed on the image display device 60. Also,
When graphic image data in the CLUT4 format is input, assuming that the output of the color information table unit 13 is 24 bits, 16 colors out of 16.770,000 colors are output as limited color data and displayed simultaneously on the image display device 60. can do.

As described above, the color information table section 13
The graphic image data extended by is input to the filter unit 14. The filter unit 14 enlarges or reduces the input graphic image data in the horizontal or vertical direction, and outputs the result. For example, 8/7 in the horizontal direction with respect to the input graphic image data
When performing the double enlargement process, assuming that the number of pixels in the horizontal direction input to the filter unit 14 is 640, the number of pixels in the horizontal direction after the enlargement is obtained by multiplying 640 pixels by 8/7.
Output as 31 pixels.

When the filter unit 14 performs the above processing, the filter control circuit 15 controls the operation of the filter unit 14. For example, when the graphic image data input as described above is to be enlarged by a factor of 8/7 in the horizontal direction, the operation of the filter unit 14 is controlled so that the input graphic pixel data is 7 pixels. To output eight pixels. That is, the filter control circuit 15 generates eight types of phase control signals so as to control the phase of the filter unit 14 in correspondence with the above-described magnification such as 8/7, and converts the phase control signals to the filter unit. To 14.

The filter unit 14 includes a filter control unit 15
Receives the phase control signal sent from the controller, switches the coefficients of the filter based on the phase control signal, calculates the input image data, and obtains the enlarged output data. For example, when performing the above-described enlargement processing by 8/7 in the horizontal direction, the filter unit 14 receives eight types of phase control signals from the filter control unit 15 and switches and inputs the coefficients of the eight types of filters. Image data to be calculated.

The area generating section 17 synthesizes an image of an image displayed on the image display device 60 with an arbitrary size based on the vertical and horizontal synchronization signals generated by the display timing generating section 16. An area signal capable of generating at least one display area is generated and generated by the image synthesizing unit. The area signal generated by the area generator 17 is sent to the image synthesizer 18.

The image synthesizing section 18 switches between the graphic image data output from the filter section 14 and the image data input from the input terminal 12 in accordance with the area signal from the area generating section 17 and outputs. A method of switching between graphic image data and image data in accordance with the area signal in the image synthesizing unit 18 will be described below with reference to the drawings.

FIG. 9 is a diagram showing a state in which two combined display areas are generated on the image display device 60. The image of FIG. 9 is, for example, the input terminal 12 in the first combined display area 62 and the second combined display area 63 in the maximum display area 61.
The case where the image input from the input terminal 11 is displayed in the surrounding area 64 outside the combined display area will be described. In that case, based on the area signal input from the area generation section 17, the image synthesis section 18 sends out the image data input from the input terminal 12 into the synthesis display area 62 and the second synthesis display area 63. The graphic image data input from the input terminal 11 is transmitted to the surrounding area 64.

Conversely, the first composite display area 62 and the second composite display area 62
When the graphic image input from the input terminal 11 is displayed in the combined display area 63 of FIG. 5, and the image input from the input terminal 12 is displayed in the surrounding area 64, the image combining unit 18 The image data input from the input terminal 12 is transmitted to the surrounding area 64 based on the area signal input from the input terminal 11, and the graphic image data input from the input terminal 11 is output to the composite display area 62 and the second composite It is sent out in the display area 63.

In the above example, the combined display area 62
And 63, an image input from either the input terminal 12 or the graphic image input from the input terminal 11 is displayed. For example, one of the combined display areas 62 and 63 is displayed. As for an image to be displayed inside, an image obtained by performing an arithmetic processing on the graphic image data input from the input terminal 11 and the image data input from the input terminal 12 in the image synthesizing unit 18 or the like may be displayed.

Referring to FIG. 9, for example, only the image data input from the input terminal 12 is displayed in the first combined display area 62, and the graphic image data and the calculation result of the image data are displayed in the second combined display area 63. Is displayed and the surrounding area 6 is displayed.
4 describes a case where only graphic image data is displayed.

When the image data output from the image synthesizing unit 18 is to be displayed in the surrounding area 64, the image synthesizing unit 18 outputs the graphic image data input from the input terminal 11, and outputs the image data. If the image data output from the combining unit 18 is to be displayed in the first combined display area 62, the image combining unit 18
If the image data output from the image synthesis unit 18 is to be displayed in the second synthesis display area 63, the image synthesis unit 18 The image data obtained by calculating the input graphic image data and the image data input from the input terminal 12 is output.

[0019]

Since the color information table of the conventional image synthesizing apparatus corresponds to the maximum bit width, the bit widths of data to be used are different, such as the CLUT8 format and the CLUT4 format. In this case, the data width to the color information table unit 13 is 8 bits, and the address lines and the processing area inside the color information table unit 13 are also configured for 8-bit data.

Therefore, for example, when graphic image data in the CLUT4 format or the like is input to the color information table section 13, 4 bits are used for 8 bits of the address line, and the remaining address lines are used. A useless dummy signal is sent out. The color information table unit 1
Since the internal color information table and the processing area are also configured for 8 bits, there is a problem that the use efficiency of the color information table is reduced when processing 4-bit data.

The color information table section 13 stores the CLUT 8
When the input data is in the CLUT4 format, it has a memory capacity (processing area) capable of outputting 256 colors of 8 bits because it corresponds to the format. Display color is 1/4 bit
There is a problem that the number of colors becomes six and the display capability is lower than the amount of installed memory.

The present invention has been made to solve the above-described conventional problems, and the bit width of the effective image data to be input is smaller than the bit width of the input of the color information table such as the CLUT4 format. In such a case, an image synthesis processing apparatus that switches a color information table in accordance with an area signal of a synthesis display area generated by an area generation unit and improves a displayable color of graphic image data in an arbitrary synthesis display area or a peripheral area thereof The purpose is to provide.

Further, an image synthesizing processing apparatus is provided which is capable of switching the above-mentioned color information table in accordance with the displayed area even when enlarging or reducing using a horizontal / vertical filter. The purpose is to do.

[0024]

In order to achieve the above object, an image synthesizing processing apparatus according to the present invention as defined in claim 1 comprises:
A color information table section having a plurality of color information tables capable of expanding the bit width corresponding to each of graphic image data having various bit widths; and a phase control signal for outputting image data output from the color information table. A filter unit capable of scaling in the vertical or horizontal direction, an image synthesizing unit for synthesizing the image data output from the filter unit with the second image data, and displaying by the graphic image data or the second image data. An area generating unit that can generate at least one combined display area that is equal to or less than the area of the maximum possible display area; and the graphic image data and the area signal of the combined display area are input and displayed in the combined display area. Different color information tables for the image data to be displayed and the image data displayed in the display area other than the combined display area. Characterized in that it comprises a color information table control unit which can be associated with Le.

According to a second aspect of the present invention, in the image composition processing apparatus according to the first aspect, an area signal of the combined display area output from the area generating section and input to the color information table control section is provided. The image processing apparatus further includes an area determination unit that outputs an area signal of a combined display area converted into a size of an area before image data is scaled by the filter unit using the phase control signal of the filter unit.

According to a third aspect of the present invention, in the image synthesizing processing apparatus according to the second aspect, the size of the area of the input image is determined from the second image data, and the area of the second image data is determined. A region signal of a region of the second image data, and a region signal of a combined display region converted into a size of the region before zooming. And outputs the result.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on illustrated embodiments. Embodiment 1 FIG. FIG. 1 is a block diagram illustrating a configuration of an image composition processing apparatus according to Embodiment 1 of the present invention. In FIG. 1, portions having the same functions as those of the conventional image synthesizing processing device shown in FIG. 8 are denoted by the same reference numerals, and redundant description will be omitted.

The main difference between the image synthesizing processor 1 of FIG. 1 and the conventional image synthesizing processor 4 shown in FIG. 8 is that the image synthesizing processor 1 converts graphic image data input from an input terminal 11 into The point is that a color information table control unit 20 that changes and outputs the color information table corresponding to the area signal from the area generation unit 17 is provided.

The color information table control unit 20 includes an input terminal 11 to which graphic image data is input, and a color information table unit 1 for expanding the bit width of graphic image data.
3, and an area generating unit 17 that generates and outputs an area signal of the combined display area. Hereinafter, the internal configuration of the color information table control unit 20 will be described in detail with reference to the drawings.

FIG. 2 shows the color information table control unit 20 of FIG.
FIG. 3 is a diagram for explaining the internal configuration of FIG. In the color information table control unit 20 in FIG. 2, reference numeral 21 denotes an input terminal to which an area signal from the area generation unit 17 is input, and reference numeral 22 denotes graphic image data input from the input terminal 11 for graphic image data. An input terminal 23 is an offset calculation circuit that calculates an offset value of graphic image data input from the input terminal 22 in accordance with an area signal input from the input terminal 21. A synthesizing circuit for synthesizing and outputting the offset value and the graphic image data input from the input terminal 22 when the offset value is output. Reference numeral 25 denotes a graphic output from the synthesizing circuit 24 to the color information table unit 13. Output terminal for image data.

Next, the operation of the image composition processing apparatus 1 according to the first embodiment will be described. Here, the operations other than the color information table control unit 20 are the same as the operations of the conventional image synthesis processing device 4 shown in FIG. Only the operation will be described.

The graphic image data input from the input terminal 11 of the image synthesis processing device 1
For example, when the data used has different bit widths, such as the CLUT8 format and the CLUT4 format, the address line input from the input terminal 11 to the color information table unit 13 is used to handle the CLUT8 format pixel data. It has an 8-bit width.

When graphic image data in the CLUT4 format is input from the input terminal 11 of the image synthesizing processing device 1, the control is not performed by the color information table control unit 20 of the first embodiment. Only four bits of the address of the color information table used in the CLUT8 format in the color information table unit 13 are used, and the color information table in the CLUT4 format is used.
However, the color information table control unit 20 of the first embodiment
In the state where the control is performed, the address of 8 bits is used and the color information table of the CLUT8 format can be used even when the graphic image data of the CLUT4 format is input.

Hereinafter, a case where graphic image data in the CLUT4 format is input to the image synthesizing processing apparatus 1 of the first embodiment will be described with reference to FIGS.

In the first composite display area 62 shown in FIG.
It is assumed that 256 colors are displayed using the UT8 format color information table, and 16 colors are displayed in the surrounding area 64 using the CLUT4 format color information table. In addition, the area generation unit 17 generates and outputs at least one combined display area that is equal to or less than the area of the maximum display area that can be displayed by the graphic image data from the input terminal 11 or the image data from the input terminal 12, for example. It shall be.

The offset calculation circuit 23 in the color information table control unit 20 uses the area signal input from the area generation unit 17 to display the graphic image data input from the input terminal 22 in the first composite display area. If it is determined that the data is data, the input 4
A 4-bit offset value arbitrarily set in advance is generated for the bit graphic image data.

The combining circuit 24 includes an offset calculating circuit 23
Is combined with the graphic image data and output from the output terminal 25 as 8-bit data.

The color information table section 13 determines whether the offset value generated by the offset calculation circuit 23 is 0 in advance,
A color information table is stored for both the case where an arbitrarily set offset value is given, and the color information table corresponding to the input 8-bit graphic image data is stored.
The data of the limited color in the bit is output.

The color information table control unit 20 in the above case
Is displayed when the surrounding area 64 outside the combined display area 62 generated by the area generating unit 17 is displayed.
Only the image data in the T4 format is sent to the color information table unit 13, and zeros are added to the remaining 4 bits, and the resulting data is sent to the color information table unit 13 as 8-bit image data.

However, when displaying the combined display area 62, the color information table control unit 20 converts the 8-bit image data obtained by combining the image data in the CLUT4 format and the offset value calculated by the offset calculation circuit 23. It is sent to the color information table unit 13.

As described above, the image synthesizing processing apparatus 1 according to the first embodiment, when the bit width of the input effective image data is smaller than the bit width of the input of the color information table in the CLUT4 format or the like, generates The color information table is switched in accordance with the area signal of the composite display area in which is generated, so that the displayable colors of the graphic image data in the arbitrary composite display area or the peripheral area can be increased.
The use efficiency of the color information table and the memory can be improved.

Embodiment 2 In the first embodiment described above, the color information table is switched in accordance with the area signal of the combined display area generated by the area generating unit. When the doubling process is performed, the graphic image data before the scaling is determined based on the area signal after the scaling, so that the peripheral image area and the combined display area do not match. It is conceivable that it protrudes into the surroundings.

Therefore, in the second embodiment, the color information table control unit 2 generates the area signal before scaling by the filter unit 14 based on the phase control signal from the filter control unit 15.
Output to 0.

FIG. 3 is a block diagram showing a configuration of the image synthesizing processing apparatus according to the second embodiment of the present invention. In FIG. 3, the image synthesizing processing apparatus 1 according to the first embodiment shown in FIG.
Portions having the same functions as those described above are denoted by the same reference numerals, and redundant description will be omitted.

The main difference between the image synthesizing processing apparatus 2 of FIG. 3 and the image synthesizing processing apparatus 1 of the first embodiment shown in FIG. 1 is that the area signal from the area generating section 17 is And a region determination unit 30 that outputs the region signal changed by the phase control signal to the color information table control unit 20.

FIG. 4 is a diagram for explaining the internal configuration of the area determination unit 30 in FIG. In the region determination unit 30 of FIG. 4, 31 is an input terminal to which a region signal from the region generation unit 17 is input, 32 is an input terminal to which a phase control signal input from the filter control unit 15 is input, 33
Is a delay circuit that delays the area signal input from the input terminal 31 by a predetermined time and outputs the delayed signal. Reference numeral 34 denotes a selection circuit 3 described later based on a phase control signal input from the input terminal 32.
Reference numeral 35 denotes a phase control circuit that outputs a control signal for switching 5. The phase control circuit 35 converts a region signal input directly from the input terminal 31 by the control signal from the phase control circuit 34 and a region signal delayed by the delay circuit 33. A selection circuit 36 selects and outputs a signal. Reference numeral 36 denotes an output terminal of an area signal output from the selection circuit 35 to the color information table unit 13.

Next, the operation of the image composition processing apparatus 2 according to the second embodiment will be described. Here, the operations other than the area determination unit 30 are the same as those of the image synthesis processing apparatus 1 shown in FIG.
Since the operation is the same as that described above, the duplicated description will be omitted, and only the operation related to the area determination unit 30 will be described.

In the following description, the filter unit 14 expands graphic image data horizontally by 8/7 times. For example, the image data of 640 pixels in the horizontal direction is expanded and output from the filter unit 14. This is a case where the number of pixels of the image data obtained is 640 × 8/7 = 731 pixels.

The area signal output from the area generator 17 is input from the input terminal 31 of the area determiner 30 and then
One is directly input to the selection circuit 35, and the other is input to the delay circuit 33. The area signal input to the delay circuit 33 is output to the selection circuit 35 after being delayed by a predetermined time, for example, one pixel of image data.

The phase control signal output from the filter control section 15 is input to the phase control circuit 34 from the input terminal 32 of the area determination section 30. In the phase control circuit 34,
Based on the phase control signal input from the filter control circuit 15, the selection circuit 35 generates a control signal for converting the area signal.

The conversion of the area signal in the selection circuit 35 is as follows.
This is performed as follows. For example, the filter control unit 15
Is a filter operation for enlarging the image data by a factor of 8/7 in the horizontal direction by the phase control signal output from the input terminal 11, and the number of pixels in the horizontal direction of the graphic image data input from the input terminal 11 is 640. In the case of pixels,
The filter control circuit 15 generates eight phase control signals for controlling the filters, and the phase control signals are input to the area determination unit 30 and also to the phase control circuit 34.

In the phase control circuit 34, based on the phase signal, the selection circuit 35 provides the delay circuit 3 with the phases 0 to 4.
A signal input from 3 is selected, and a control signal for selecting a signal from the input terminal 31 for phases 4 to 7 is output to the selection circuit 35. In this way, the area generation unit 1
The area signal input from 7 is changed (reduced) to 7/8 times and output from the output terminal 36 to the color information table control unit 20. The following operation of the color information table control unit 20 is the same as the operation of the first embodiment, and thus the description is omitted.

The area generating section 17 generates an area signal for setting an appropriately sized composite display area in 731 pixels which is a horizontally enlarged size of the image data to be displayed. I do.

Then, the area determining unit 30 of the second embodiment
Then, from the area signal generated by the area generating section 17 and the phase control signal generated by the filter control section 15, image data (number of pixels) having a horizontal size before being enlarged is obtained.
Generate a region signal for. This operation will be described with reference to FIG. 5, which is a diagram showing an area displayed on the image display device 60.

FIG. 5A is a diagram showing the relationship between the graphic image data enlarged by the filter unit 14 and the combined display area 62a generated by the area signal. FIG.
In (a), the maximum display area 61a is an area of 731 pixels in the horizontal direction displayed on the image display device 60,
The first combined display area 62a is a display area provided in the maximum display area 61a of 731 pixels according to the area signal, and the surrounding area 64a is located in the maximum display area 61a and around the first combined display area 62a. Area.

When the area signal of the first combined display area 62a is sent to the maximum display area of 640 pixels before conversion by the filter section before combination and the first combined display area 62a is determined, the first combined display area 62a is determined. The combined display area 62a will be too large.

Therefore, as described above, the area determination unit 30
Then, based on the phase control signal input from the filter control circuit 15, the selection circuit 35 converts (reduces) the area signal to the size before enlargement and outputs the converted signal to the color information table control unit 20.

FIG. 5B shows a composite display area 62 b generated by the graphic image data and the area signal before being enlarged by the filter section 14 and converted by the area determination section 30.
FIG. In FIG. 5B, the maximum display area 61b is an area of 640 pixels in the horizontal direction displayed on the image display device 60, and the first combined display area 62b.
b is a maximum display area 61b of 640 pixels according to the area signal.
The surrounding area 64b is located within the maximum display area 61b and is located within the first combined display area 62b.
It is the area around.

As described above, the image synthesizing processing apparatus 2 according to the second embodiment, even when the synthetic display area is generated in the area where the image data is scaled by the filter unit, is adapted to the color information in accordance with the synthetic display area. The displayable colors of the image data can be increased by switching the table, and since the output image matches the composite display area, the color of the composite display area does not protrude into the surrounding area.

Embodiment 3 In the second embodiment described above, the area signal of the combined display area for displaying graphic image data by the area determination unit is made to match the area before scaling by the filter unit, but the combined display generated by the image combining unit In the area, the image data input from the input terminal 12 is displayed, or conversely, the input terminal 1
In some cases, a graphic image is displayed by providing a combined display area in the image data input from Step 2. In that case,
Since the composite display area of the image data input from the input terminal 12 is after the scaling by the filter unit, the graphic image data can be handled before the magnification. It is conceivable that, for example, an image of a peripheral area protrudes into the combined display area without matching the areas.

Therefore, in the third embodiment, the input terminal 1
2 is provided with a sub-region determination unit 40 that determines the region of the image data input from the input terminal 2 and outputs the image data to the region determination unit. The boundary with the display area can be clarified.

FIG. 6 is a block diagram showing a configuration of the image synthesizing processing apparatus according to the third embodiment of the present invention. In FIG. 6, the image synthesizing processing apparatus 2 according to the second embodiment shown in FIG.
Portions having the same functions as those described above are denoted by the same reference numerals, and redundant description will be omitted.

The main difference between the image synthesizing processing apparatus 3 of FIG. 6 and the image synthesizing processing apparatus 2 of the second embodiment shown in FIG. 3 is that the area of the image data input from the input terminal 12 is determined. The difference is that the sub-region determining unit 40 for outputting to the determining unit is provided, and the input from the sub-region determining unit 40 is increased by one system to the input of the region determining unit 50 in relation to the above.

FIG. 7 is a diagram for explaining the internal configuration of the area determination section 50 of FIG. In FIG. 7, the same reference numerals are given to the portions having the same functions as those of the area determination section 30 of the second embodiment shown in FIG. 4, and the overlapping description will be omitted.

The main difference between the area judging section 50 of FIG. 7 and the area judging section 30 of the second embodiment shown in FIG. 4 is that an input terminal 51 to which an area signal from the sub area judging section 40 is input is connected. In the selection circuit 52, based on a control signal or the like from the phase control circuit 34, the area signal from the input terminal 31, the delayed area signal from the delay circuit 33, and the input terminal 51
The point is that the selection is made from the area signal from.

Next, the operation of the image composition processing apparatus 3 according to the third embodiment will be described. Here, the sub area determination unit 40
The operation other than the area determination unit 50 is the same as the operation of the image synthesis processing apparatus 2 shown in FIGS. Only the operation that is performed will be described.

The sub-region determining unit 40 determines the size of the region of the image data input from the input terminal 12 and outputs the same to the region determining unit 50. For example, the following determination method is used. It is.

When the area of the image data input from the input terminal 12 is a reduced image, the size of the image area is smaller than that of the normal image area. It is a constant value when there is no. Therefore, the constant value is counted by a counter or the like (not shown), and if the constant value exceeds a predetermined numerical value from the count result, it is determined that the part is an image of the surrounding area. In this way, the surrounding area and the image area necessary for image display are determined, and an area signal of the image data input from the input terminal 12 is created. The area signal output from the sub area determination unit 40 is input to the area determination unit 50.

Next, the operation of area determining section 50 which has received the area signal output from sub area determining section 40 will be described with reference to FIG. When the area signal determined by the sub area determination unit 40 is input from the input terminal 51, the area signal is
The data is input to the selection circuit 52. In the selection circuit 52, the area signal input directly from the area generation unit 17 and the area generation unit 1
7 is switched between the area signal input after being delayed by the delay circuit 33 and the area signal input from the input terminal 51 based on a control signal from the phase control circuit 34 and the like.

As a switching method, for example, when the graphic image data is enlarged or reduced in the filter section 14, the selection circuit 52 is switched based on a control signal from the phase control circuit 34. However, when no enlargement or reduction is performed in the filter unit 14,
Regardless of the control signal from the phase control circuit 34, for example, the selection circuit 52 is switched so as to preferentially select the area signal input from the input terminal 51. The area signal selected by the selection circuit 52 in this manner is output from the output terminal 36 to the color information table control unit 20.

As described above, the image synthesizing processor 3 according to the third embodiment is provided with the sub-region judging section 40 for judging the area of the image data inputted from the input terminal 12 and outputting it to the area judging section. The display area of the graphic image data input from the input terminal 11 and the display area of the image data input from the input terminal 12 can be clearly defined so that the image data input from the input terminal 12 is displayed, or vice versa. Even when a graphic image is displayed by providing a combined display area in image data input from the input terminal 12, the color information table is switched according to the combined display area to increase the displayable colors of the image data. Since the output image and the composite display area can be matched, the image of the peripheral area does not protrude into the composite display area.

[0072]

As described above, according to the first aspect of the present invention, when the bit width of the effective image data to be input is smaller than the bit width of the input of the color information table, the color information table controller is provided. The color information table is switched according to the area signal of the combined display area generated by the area generating unit, so that the displayable color of the graphic image data in an arbitrary combined display area or a peripheral area thereof can be increased. Therefore, the use efficiency of the color information table, the memory, and the like in the image synthesis processing device can be improved, and the ability of the image synthesis processing device to display the image on the image display device can be improved.

According to a second aspect of the present invention, even in the case where an area judging section is provided and a synthetic display area is generated in an area in which image data is scaled by the filter section, the color is adjusted in accordance with the synthetic display area. By switching the information table, the displayable colors of the image data can be increased, and the output image and the composite display area are matched, so that the area signal can correspond to the enlargement / reduction at the time of the filter operation. Can be obtained with respect to the combination area set in accordance with (1), and the color of the graphics display does not protrude into the surrounding area.

According to a third aspect of the present invention, a display area for graphic image data and a display area for image data are provided by providing a sub area determination section for determining an area of input image data and outputting the area to the area determination section. The boundaries of
Even when displaying image data input from the input terminal, the displayable color of the image data can be increased by switching the color information table according to the combined display area, and the output image matches the combined display area. Since it is possible to set the combined display area based on the size of the area of the input image data, the image of the peripheral area does not protrude into the combined display area at that time, and the image The ability of the processing device to display on the image display device can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image synthesis processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a color information table control unit in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of an image synthesis processing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of an area determination unit in FIG. 3;

FIGS. 5 (a) and 5 (b) are diagrams showing a difference in a combined display area according to the second embodiment.

FIG. 6 is a block diagram illustrating a configuration of an image synthesis processing device according to a third embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of an area determination unit in FIG. 6;

FIG. 8 is a block diagram illustrating a configuration of a conventional image synthesis processing device.

FIG. 9 is a diagram illustrating a combined display area of the image combining processing apparatus.

[Explanation of symbols]

1-4 image synthesis processing device, 11, 12, 21, 2
2, 31, 32, 51, input terminal, 13 color information table section, 14 filter section, 15 filter control section, 16 display timing generation section, 17 area generation section, 18 image synthesis section, 19, 25, 36 output terminal, Reference Signs List 20 color information table control unit, 23 offset calculation circuit, 24 synthesis circuit, 30, 50 area determination unit, 33 delay circuit, 34 phase control circuit, 3
5 selection circuit, 40 sub-region determination unit, 60 image display device, 61, 61a, 61b maximum display region, 6
2, 62a, 62b First combined display area, 63 Second combined display area, 64, 64a, 64b Peripheral area.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G09G 5/36 H04N 5/262 5C079 H04N 1/387 5/66 D 5C082 1/46 9/74 A 5 / 262 G09G 5/36 520L 5/66 520C 9/74 520P H04N 1/46 Z F term (reference) 5B057 CA01 CA08 CA12 CA16 CA17 CB01 CB08 CB12 CB16 CC03 CD05 CE06 CE08 CE17 CH07 5C023 AA02 AA11 AA10 BA11 CA11 AA06 AA11 BA17 BA21 BA24 BB14 5C066 AA03 AA11 CA05 ED04 ED09 EE11 GA26 HA01 KC01 KC11 KE02 KE09 KG01 KM11 5C076 AA19 AA21 AA22 AA26 BA06 CA02 CB02 5C079 LA10 LA31 LA37 LA05 LA12 LA05 DA51 DA71 MM10

Claims (3)

[Claims] 1. A color information table section having a plurality of color information tables capable of expanding the bit width corresponding to each of graphic image data having various bit widths, and an image output from the color information table. A filter unit capable of scaling data in a vertical or horizontal direction by a phase control signal; an image synthesizing unit for synthesizing image data output from the filter unit with second image data; An area generating unit that can generate at least one combined display area that is equal to or less than the area of the maximum display area that can be displayed by the image data of the graphic image data and the area signal of the combined display area; For each of the image data displayed in the combined display area and the image data displayed in the display area other than the combined display area, Image synthesis processing apparatus, characterized in that it comprises a color information table control unit the color information table composed can correspond. 2. An image data is scaled by a filter unit using a phase control signal of the filter unit for an area signal of the combined display area output from the area generation unit and input to the color information table control unit. The image composition processing apparatus according to claim 1, further comprising an area determination unit that outputs an area signal of the combined display area converted to a size of the area before the image is combined. 3. A sub-region determining unit that determines a size of a region of an input image from the second image data and outputs a region signal of the region of the second image data, 3. The image synthesizing process according to claim 2, wherein an area signal of the area of the second image data and an area signal of a synthesized display area converted into the size of the area before scaling are switched and output. apparatus.